K 10
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V 3
imp
K 8
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V 27
2018-07-28T19:44:20.179139Z
K 7
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V 526
Be more conservative about setting hw.uart.console

Note when we've found a 8250 PNP node. Only try to set hw.uart.console
if we see one (otherwise ignore serial hints). The 8250 is the only
one known to have I/O ports, so limit the guessing to when we've
positively seen one.  And limit this to x86 since that's the only
platform where we have I/O ports. Otherwise, we'd set the serial port
to something crazy for the platform and fall off the cliff early in
boot.

Differential Revision:  https://reviews.freebsd.org/D16463

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